Why won't my chickens roost in their coop? It's freezing outside....

All but two of my chickens roost on the outside roosts instead of inside the hen house. It's now reaching below 0 at night. Are they smart enough to go inside if it's too cold? I'm worried about frost bite....

I've tried moving them inside. Sometimes they'll stay put, and other times, they just choose to go back outside. The hen house roost is actually higher than the roost outside, so I'm not sure why they prefer the outdoor roosts. My coop is based on the Garden coop design.

Should I try to keep moving them inside or just trust that they know what's good for them?

The coop run is fully enclosed with a roof and hardware cloth, so it's safe against predators. Their outdoor perches are 4" natural branches--same as the indoor perch.

For the last two nights, I've been "tucking them in" -- picking them up and putting them on the indoor perch. They stay there once they're up, so I'm guessing that it's just habit that's driving them to go outside?

I think will try removing the outdoor perch if they don't eventually start tucking themselves in...

I let mine stay out. At least the standards and adults, banties or juveniles I would be a little more concerned with. Mine have slept in their enclosed run for years, havent had one freeze yet. I do cover the sides with tarps to help keep the wind off of them, that might be easier than moving them each night. I admit I did try moving mine for a month or so at first, but i either have dumb or stubborn birds and they never got the hint.

Last summer I got in the habit of manual putting my birds in at night because of coop construction that that wouldn't allow for their normal routine (our coop door is 36" off the ground with a 7' ladder and both were removed during a remodel). It only lasted a week but once everything was back to normal it took them another several days to start going back in themselves. Has anything changed in their environment? Are the outside roosts new?

Interestingly, my large laying hens go right for the top 2" round dowel nightly. Their heads are only about 4" from the roof when roosting. Even though there are two lower options available, so I guess it depends on the hen.